Return TiVo Premiere to stock firmware after Comcast?

We loaned our TiVo Premiere (TCD746320) to our daughter who used it with Comcast service. It's back now and working on Charter but the firmware is altered from the stock that it shipped with. Most egregiously, all the streaming apps (Netflix, Hulu, etc.) are removed. I did an erase and restore before pairing with the Charter CableCard but the Comcast firmware remains.

Is there any way to get this back to stock so this TiVo can use the streaming apps again?